116 entries under harden topic. ×
| fossilize(verb, close, set, fix, settle) | |
| frost(freeze, chill, solidify, ice) | |
| gelate(verb, form, set, fix, develop) | |
| gelatinize(verb, form, set, fix, develop) | |
| glaciate(freeze, bite, chill, nip) | |
| habituate(verb, dull, develop, rough, adjust) | |
| inflate(verb, thicken, solidify, congeal) | |
| inure(verb, dull, develop, rough, adjust) | |
| jellify(verb, form, set, fix, develop) | |
| jelly(verb, form, set, fix, develop) | |
| make callous(verb, expression, dull, develop, rough) | |
| nip(freeze, bite, chill, solidify) | |
| paralyze(verb, dull, develop, rough, adjust) | |
| pierce(freeze, bite, chill, nip) | |
| press(verb, close, set, fix, settle) | |
| refrigerate(set, freeze, chill, thicken) | |
| render insensitive(verb, expression, dull, develop, rough) | |
| roughen(verb, dull, develop, rough, adjust) | |
| season(verb, dull, close, set, develop) | |
| stun(verb, dull, develop, rough, adjust) |
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| APA | Smart Define. (2015). stiffen thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/stiffen/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiffen thesaurus" https://smartdefine.org/stiffen/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, stiffen thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/stiffen/thesaurus/synonyms>. |
| MLA | Smart Define. "stiffen thesaurus" 13 April 2015. Web. 30 September 2026. <https://smartdefine.org/stiffen/thesaurus/synonyms> |